What occurs with all the right goodies set up is that the X server calls
VIDIOCSFBUF to pass the physical frame buffer address.
> And that the option to pass a user space address to VIDIOCSFBUF and have
> it translated, while making wild assumptions about the object mapped
That is so you can pass virtual frame buffer bases - which some ports need.
It isnt used for capturing by applications. And you'll note VIDIOCSFBUF
is root only, while MMAP and VIDIOCMCAPTURE are not
Alan
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